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Home >> Cadillac >> 2020 >> XT6 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 168 (Wiper System And Washer System) >> Diagnostic Information And Procedures >> DTC B3810 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2020 Cadillac CT6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the G16 Headlamp Washer Pump. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2, ignition ON/vehicle in Service Mode.
  4. Verify the test lamp does NOT turn ON and OFF when commanding the Headlamp Washer Relay Active and Inactive with a scan tool.
    • If the test lamp turns ON and OFF 

      Test or replace the G16 Headlamp Washer Pump.

    • Go to next step: If the test lamp does not turn ON and OFF 
  5. Ignition OFF/Vehicle OFF, connect the harness connector at the G16 Headlamp Washer Pump. Disconnect the X2 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 minutes for all vehicle systems to power down.
  6. Test for less than 10 Ω between the ground circuit terminal 38 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  7. Ignition ON/Vehicle in Service Mode.
  8. Verify the G16 Headlamp Washer Pump is not activated.
    • If the G16 Headlamp Washer Pump is activated 
    1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the G16 Headlamp Washer Pump, ignition ON/vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit terminal 1 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the G16 Headlamp Washer Pump.
    • Go to next step: If the G16 Headlamp Washer Pump is not activated 
  9. Connect a 20 A fused jumper wire between the control circuit terminal 26 and B+
  10. Verify the G16 Headlamp Washer Pump activates.
    • If the G16 Headlamp Washer Pump does not activate 
    1. Ignition OFF/Vehicle OFF, remove the jumper wire, disconnect the harness connector at the G16 Headlamp Washer Pump.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the G16 Headlamp Washer Pump.
    • Go to next step: If the G16 Headlamp Washer Pump activates 
  11. Ignition OFF/Vehicle OFF, connect the X2 harness connector at the X50A Fuse Block - Underhood. Disconnect the X5 harness connector at the K9 Body Control Module, ignition ON/vehicle in Service Mode.
  12. Verify the G16 Headlamp Washer Pump is not activated.
    • If the G16 Headlamp Washer Pump is activated 
    1. Ignition OFF/Vehicle OFF, disconnect the X1 harness connector at the X50A Fuse Block - Underhood, ignition ON/vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit terminal 6 X1 and B+
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G16 Headlamp Washer Pump is not activated 
  13. Connect a 10 A fused jumper wire between the control circuit terminal 26 and B+
  14. Verify the G16 Headlamp Washer Pump activates.
    • If the G16 Headlamp Washer Pump does not activate 
    1. Ignition OFF/Vehicle OFF, remove the jumper wire, disconnect the X1 harness connector at the X50A Fuse Block - Underhood.
    2. Test for infinite resistance between the control circuit terminal 6 X1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If less than infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the X50A Fuse Block - Underhood.
    • Go to next step: If the G16 Headlamp Washer Pump activates 
  15. Replace the K9 Body Control Module.
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